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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa8bc64b4017c0248a33b7255e052ec2f49b508e7f2a6b02bf2e4c5cc6ac7ea' 
  AND token = 'lokRWemXwOUAzuQTz/xjY47UZro5E/ilp9C6rpmEQlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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