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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70c8a25b8d2818a3e002b5a85d64b3c3d9e4fe8ff218cb117c637ea4000e3f9' 
  AND token = 'sFACWIz8OQt6HzHzo/eSn7vxs9FpYnVfHANSkV24s+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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