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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a80903c50515fa9ce483f93746c2aaf6abc8405121f746b8f6991a71ca46e2' 
  AND token = 'WLtt7atEURIeIwQ45SjjYUph1mEc+JFUBOHNMlPXFaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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