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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c5471fb503797454ba9224929fd3d9e7a8207410e7be0f07d409aaf712cfed' 
  AND token = 'e6OUvMtfpxoLEli6HfUFRgKY0xUClZONCQ2ojSrZEx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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