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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367038a993fa9ae25bd5324137a3e072d19a51a11e4b0cd9e392a3fdb3b3bef5' 
  AND token = 'g22OwtbzPxexxLA9cuZ65bxkUfRNt7qDIswH9jQmqag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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