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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6286031f764abfddf88a7693ea9aa592bd63e01e2faa9fdbeebf76b4fd4a092' 
  AND token = 'WNCR94OgBW0Fv57I+1zsK8h4HxHQosv+ijeegKr4ueE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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