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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18bc351eeef3366e18e65d5e2eb00f005f02ed1b0874f8fe879869b864c7fc6' 
  AND token = 'OyP6xMNt7wgz6N3WRs4zOXlRWZ/1D5syOgUEFenHYv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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