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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ddb4736706330185ebc4828afaa4dea9dbeb51d4b79763770bf3c088d1c1d5f' 
  AND token = '8xdW1QEG8A00V/L08St5VMmFlpf8oVl+mFcYl98Hy0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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