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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e086d98d741a9098596beffc5206893f12aa954295aab6648dcb249c3bc2cd8' 
  AND token = 'NMd/36yKVELpJBjXVvelW8SD9P4avkeRSy1/mdSRNIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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