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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99c4b804aa2a1a70d689675f2e52f3a54531922046cb9fcc8fdd99c10c4c73c' 
  AND token = 'sd0LMltasBdAtwLbv66mtXQQdcTzjE9FVlWlafdjKZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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