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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efeb90d27115c19d0365b38ce8feb9b019b9d1eb2e1637d5c3067af962717eaa' 
  AND token = 'htZ6+OZSPo3N3oAtDsS3zCfM4mexwyoqedrlOFnKwKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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