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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8741f07d1c1ca9b6b796da2490f80efac4dd295406ae3389ae007ae4d5ac42c' 
  AND token = 'j9j1Vfy1uR4bvSY9zA35d/vd3VFAzYqPnh7fVjXAsX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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