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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465131d56dadd98128e7bc96865d02bef664985c18722fdf74a11120d0d1f03f' 
  AND token = '6m84q7jEtwgigHdf4J2gcRAFT5/n23jFGWLaf7DendE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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