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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aba68724cb201d15ae6ddca187e6073b20f9d8b7772e11b0a8203d1b0fef44d' 
  AND token = 'p3mjU9R+rXYbYGUKbBfcmRS4awI1COA6PDau9LMJ2i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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