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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4b226c4ddfee250ae50aeca8a27e13e44e2904339e3f320e03d7b3afc8d16f' 
  AND token = 'm2+xgaIurWslVeM2/RNWKkWRjrYcj56QZCzquLMtq8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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