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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be4202007d3d2972e051b852e62299c89ebf4c6f974ee14740674da7abf067e' 
  AND token = 'hpveYdTLToun0r5wfjOaNR2IkONyK915nmI92bvsd+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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