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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f824a46b2dbf7cff63043bbf8bf71e930b469d1c2911db163f7e26fef279c35' 
  AND token = 'NURln67hTQ/zDSMLnNkNIeoTB9pgXGL0Quhm1hTt808=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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