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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaba835034eee74b45dbbe7e04a0bf96ca6743cec3a13ebbb187e194d8b52209' 
  AND token = '3rzHqYK+ACqxojLDTr33Gz7DUtI4iwv0f9XgseNLvuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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