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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc473695584e13c390c84952cbc88dd4185b8a59b2cc431629372517004eca1' 
  AND token = 'nGUf2jivNjokqf2ERQ1AbDLb0FnYeMV5HhJxMo5iYgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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