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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb229f65e8842e097285c2e7f68b774c0d2509553ba73ea3e8e1858983df1df' 
  AND token = 'jeHy5U8EMd4FU3Qj3t5ZCCdi8Ajj857var2ku4IWSdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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