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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43b26cbd96b27d190e53c19e4ac86399794dc85fec80f546917eb2cce648221' 
  AND token = 'xpi0e1Yei3lRBOJ5hfsKh4ca6hRzSPK0vq54Gsx8nIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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