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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '780ad62b2dee7f644a307aa4da61cd7d4c1141143aae5f680c228265791a7d34' 
  AND token = 'DYRTZDEjL0Hvak07QwoNKuDmW9EHDAwLf8LoeWyqzTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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