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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9147cda62bc3b2ce7cc11fca8605e26e0381777f899184867fc914c9d593f8' 
  AND token = 'lREXbqmedZM8/4y6fReqr/6tA+nti6smHnkaV3C/OTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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