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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ebd24eb4779d55628442f45de591a22d2cea546b464b1bc8d854a414ef644e' 
  AND token = 'YgEP2Wx225EfZ1KXibS671HuF+st8qhpe+bn3XIwOVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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