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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b4206275ddbe9756ae69534038b24a2ec0c388a851f1559fcf5024c23247d6' 
  AND token = 'JWDjgQdCbwkGpJ+J7G9X4y4sd2ZDzcaufTrCEpnC5+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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