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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d98b3afa900a6fb706044e46416f25562a44eb934007917caa9e17fa787c7f' 
  AND token = '0YbDGYBSqibr25UzkjKtGGMPZHUxuYv5PPK0ie6fNEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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