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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927fe3584691c7e4635b17842e16f286cadb90a6b4e586fb18a8c7d992a886e0' 
  AND token = 'efAjDX53V7doYY/oupp4XV3FQreB1Jfqrx4dV0tHjEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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