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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012084e11f61f70e13bf997ddf82f5b1e4e2a7b1118645e47f22268d68eec1fc' 
  AND token = 'FpZelHlOkxpvyWDpBFY6WzNIXV3K2gLS0y/yrVGp2GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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