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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132c8ca2cbf7499ad7b404bfc10bf8f2a963c066b5255b6c29a388ff4f787338' 
  AND token = 'yjZC2lqN3qYD7N2VriMoQXnB/D3T3GYradEfhlS7G9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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