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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd1bc002d0c185ad81fd8590d408a98b23aeb64b75dd3971d45e3ee8bf0ff3c' 
  AND token = 'JQBOHOlFQBvb+a6bTtzjluzKne5o5TcOGAHqMmGapkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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