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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d134cd8cedc868b534b2749dc85dfba1b761b55689e5f44179cdf06fe741a0c' 
  AND token = 'dLPVJyFkOS4aVdftgTQRaWaj7T7oaehiKCNKFEt8/CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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