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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547aa4b6c2d065abe2597af7957bf9e18c833cb2779605ff352354e1eaddea2a' 
  AND token = 'HwhU6Gd0dG2Bopv5QEbivGvetLdt9bepepjwbvZk1rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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