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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8dc23650c2d15a895baabeadf2a1ec062bc8c4f5a4e8a5bbc656e25801b4cc4' 
  AND token = 'KUrd9oWnSxyQAM1NrQNHVw0Nru3+jsux+Rj1Dp04vvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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