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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69a55055868bab53713cfdade0f24f55210232eb2c3af9d4fccd4b2b2e2a8be' 
  AND token = 'GRXjpf3IzDrL3AIlNjjIzTdmuayWzQXpSsstwpvWzp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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