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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5c21df6fa6aa2a6ee4db9d8c886c650b722c4a2b6bacccf5a6c498c44f3134' 
  AND token = '+j2Tm3qiiEHYlaRFpq28tSySBOjiHjoqwbbq1wMB+Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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