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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab54bc7e93f4b7c6fee81233c8fca958cbda415616e27a0edf5ee457fc745c6' 
  AND token = 'eapPpLd+G8g2C6+hOSP33SDCd6LHOUKRVT6288uW4hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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