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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a16f85bdee659a004bd61a941d6bd8a7e3e93879e0618d18b5479662943b07' 
  AND token = 'ktHy29xzFQ4P/TKRWzWpPrm5b3Yncxx1lSF27mnWyG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}