SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372e99416299c8f14a8b46486bad28c173b57a80716488e0e7028441306235f2' 
  AND token = '4LqfhKz3QkvMaZ33/L+tE/XuxP63Mpp/RBIpsmTRLRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00288

JSON explain

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