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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595cdf56599ce06221126a444714fb25fb79724c8fbcd5b6758ed7ae9352b76a' 
  AND token = 'lm2HCT0t3S90RWhVfxjyRn1OdkOK/5NoWIHgzlUaFC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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