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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1dbb4104f3b82d956f687218e380c59fd8af7f8ddc89c0b9535f40aa44ac58' 
  AND token = 'yAipF3qWzXgx1FD952vRpdrcPlqiVQkGIonSnauOIfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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