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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a25b77bcf1328bfec499c6b4f6f14954fe6f4a52c768f24f349b2f986d5fd7' 
  AND token = 'MAjD5MrvajwHirtFuOF7CjTzG79o+MK/c7aODkLF3TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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