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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49cd9e14c4327335e11ec64f4d36a0fdc70489e419b4006cba6d4d1c031ef271' 
  AND token = 'quXqSnruFOc1IcEQUJ0F9jsIplyPvLWvnFNk2MPWbZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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