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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d072c042182abb1e3c74cdf4a91dac903e15a54bd27c6babd9d3e6564e1bc37' 
  AND token = 'HXV2nJdD2DNvcos3pusKQQMNWEEsDa0JVWBN587mgWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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