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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65d791d1971144bb6717ad691d6907a13d7c43002a9d1b614ed0a9e963698ba' 
  AND token = 'EBT57xWFG9RCVcF/Haste1W8RUZ/+Gj5/uIPbQ4En9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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