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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2b9ca92641721a92e803c7e2d4fe3c00f0f564dd54af2bc9862aeb7caccf35' 
  AND token = 'jlPwHV17hDnM12PP+PohGjmVY1b2RsVxu+tekjpuLGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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