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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889925e981d03cd52fb5ede7eb646eba138c50fda926e14938163375c4c0393d' 
  AND token = 'FB/RPWfiUwaAEEwdKpF31bk1p6EZGvX7NqoL/ZMvCTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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