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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117bd9bfc0503645a2cf77f2afbc2f13b4a922d011be6ce53beade4955becf5b' 
  AND token = 'hJzKWHiz8OrHJKyhm68C9mQjqe+tXl0lcqoB3cya7IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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