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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b22f63a0edc36d86d777c2255c91ae1404c75bf3e3d638a922b23a947198e9' 
  AND token = '737pWok7Kx/WUBOodBgbcpLh+6FdD2kbveGWlJcAvLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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