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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acd41b4531ac0b9315ab04428783d39157a27c5e3d39baa1f019192a5457d4c' 
  AND token = 'Br2vJk0zI/UsBTz1i+3Lmo5J6qhLUXr7SsGKgHnLckM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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