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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2d39c2a25af7f5bfce3ca816d616260832f07736c914c904ca19b1d93a5c3d' 
  AND token = 'Udy1kNm86MA1t312NcPRuAL1Re45e6fmg4fCYOzp+F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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