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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8b6149f65278ea78ea4cf0b34dfe5afd3c85c6c2603dae700088ad02b24b55' 
  AND token = 'Yg1E4uDh7TUQX8aYPyBZUCmQ/NJ/EltQdNPyM6J3e+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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