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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80907400ff206205d5190b16fb53ec2fab2c71641cc8cc4d1077206807bbbc9' 
  AND token = 'eyhpiFDnD8sdIkU2lyDjuCFqbNeoZVfErxvraa6I7SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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