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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982d141849cd8809f8dd76b8049a537b23e562a4fce476ca3a22ea24a09794ce' 
  AND token = 'DbG1UeFxLdAmFZnAjg6I4i6RkYq03FCS8Of6ZRiN0HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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