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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea9311303fb1412fb719d353c0d2a6b3530dd0aa5fe97d000819eb9c406dd8b' 
  AND token = 'JiGTjXU5+8ZgflFew0vhm/rt4p/rig85RW7YeNTtAag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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