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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb030927e286a33d5e52639ecf2b341e6ca32e792eb0d6fc2da7f34b1b0b2a8' 
  AND token = 'z5CmSXYrR5yb7S4mkJ9SgBBjajXVbP15uK5mCLEFJOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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