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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f83ad222982eb7e470146d2e29e46b60d04d6b3eb9d59287f3808583368f2e8' 
  AND token = 'gEefCa0K8q+1Gx9mIpcn8OVopfNk/I8gDM3r8XdL4CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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