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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd9ec5fa9bfb79b58c27cbbf275e195b133a434e621620e037b43cdfd3cbe1e' 
  AND token = 'R4Oj9n34moMb+0olpAsOI+mQCcCH6FuQVCpcPGa0UR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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